circuitpython/tests/micropython/heapalloc.py

# check that we can do certain things without allocating heap memory

import gc

def f1(a):
    print(a)

def f2(a, b=2):
    print(a, b)

def f3(a, b, c, d):
    x1 = x2 = a
    x3 = x4 = b
    x5 = x6 = c
    x7 = x8 = d
    print(x1, x3, x5, x7, x2 + x4 + x6 + x8)

global_var = 1

def test():
    global global_var
    global_var = 2      # set an existing global variable
    for i in range(2):  # for loop
        f1(i)           # function call
        f1(i * 2 + 1)   # binary operation with small ints
        f1(a=i)         # keyword arguments
        f2(i)           # default arg (second one)
        f2(i, i)        # 2 args
    f3(1, 2, 3, 4)  # function with lots of local state

# call h with heap allocation disabled and all memory used up
gc.disable()
try:
    while True:
        'a'.lower # allocates 1 cell for boundmeth
except MemoryError:
    pass
test()
gc.enable()